Has the fact that a “remove curse” casted on the lycanthrop Blood Hunter basically takes away their whole subclass been addressed?

If the DM is trying to rob you of your subclass permanently, that’s an issue. The idea that it can be removed is addressed in the flavor text box “The Onus of Lycanthropy”, where they return to their order to be re-cursed. 🙂

— Matthew Mercer (@matthewmercer) January 28, 2020